Thinking Mathematically (6th Edition)

by
Blitzer, Robert F.

Answer

80.5 km

Work Step by Step

We can convert 50 miles to units of centimeters.
$50 ~miles = \frac{50~mi}{1}\times \frac{5280~ft}{1~mi}\times \frac{12~in}{1~ft} \times \frac{2.54~cm}{1~in}$
$50~miles = 8046720~cm$
Since 1 km = 100,000 cm, we need to move the decimal place 5 places to the left to convert from units of cm to units of km.
$50~miles = 8046720~cm = 80.5~km$